8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=8505e003, *pmd=fee5e003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 3786 Comm: syz-executor.1 Not tainted 6.9.0-rc4-syzkaller #0 Hardware name: ARM-Versatile Express PC is at page_zonenum include/linux/mmzone.h:1100 [inline] PC is at __kmap_local_page_prot+0xc/0x74 mm/highmem.c:573 LR is at kmap_local_page include/linux/highmem-internal.h:73 [inline] LR is at copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360 pc : [<80479ea8>] lr : [<807e997c>] psr: 60000013 sp : e0845ca0 ip : e0845cb0 fp : e0845cac r10: 00000018 r9 : 8285a4e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 84f43000 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85029400 DAC: 00000000 Register r0 information: NULL pointer Register r1 information: NULL pointer Register r2 information: non-paged memory Register r3 information: non-paged memory Register r4 information: slab kmalloc-1k start 84f43000 pointer offset 0 size 1024 Register r5 information: NULL pointer Register r6 information: NULL pointer Register r7 information: NULL pointer Register r8 information: NULL pointer Register r9 information: non-slab/vmalloc memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xe0844000 allocated at kernel_clone+0xac/0x3cc kernel/fork.c:2796 Register r12 information: 2-page vmalloc region starting at 0xe0844000 allocated at kernel_clone+0xac/0x3cc kernel/fork.c:2796 Process syz-executor.1 (pid: 3786, stack limit = 0xe0844000) Stack: (0xe0845ca0 to 0xe0846000) 5ca0: e0845ce4 e0845cb0 807e997c 80479ea8 e0845cd4 e0845f48 8024c880 84f43000 5cc0: 84f43000 00000000 00000001 00000000 000000c7 00000018 e0845d34 e0845ce8 5ce0: 814333f4 807e9890 84ba6100 84972800 84972800 849728d0 84ba6100 849728d8 5d00: e0845f48 00000002 00000000 84ba6100 000000c7 84972800 84bdc800 00000000 5d20: 00000102 00000000 e0845da4 e0845d38 816560a8 81433310 00000102 00000000 5d40: 00000000 00000000 00000000 00000000 84ba6188 849728ec 84ba6334 e0845f38 5d60: 00000000 6c6e633d 818c33d0 821a9848 00000102 6c6e633d e0845f38 81655f58 5d80: e0845f38 8441d900 00000102 00000000 00000102 e0845df4 e0845dc4 e0845da8 5da0: 81655124 81655f64 00000000 00000102 00000000 816550ec e0845de4 e0845dc8 5dc0: 813a29d4 816550f8 e0845f38 8441d900 200004c0 00000000 e0845ea4 e0845de8 5de0: 813a2bd4 813a2990 00000000 00000000 00000001 00000000 00000000 00000000 5e00: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5e20: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5e40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5e60: 00000000 00000000 00000000 00000000 00000000 6c6e633d 00000000 00000000 5e80: e0845f38 200004c0 00000102 8441d900 84bdc800 00000129 e0845f24 e0845ea8 5ea0: 813a5b18 813a2b50 00000102 00000000 00000008 00000000 00000000 200002c0 5ec0: 000000c7 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5ee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 6c6e633d 5f00: e0845f24 8441d900 00000000 200004c0 00000102 80200288 e0845fa4 e0845f28 5f20: 813a6294 813a5a9c 00000000 e0845f38 00000001 fffffff7 e0845df4 00000000 5f40: 00000000 00000000 00000000 00000001 200002c0 000000c6 00000001 00000000 5f60: 00000000 00000001 00000000 00000000 00000000 00000000 00000000 00000000 5f80: 8020ca6c 6c6e633d 00000000 00000000 0014c2c8 00000129 00000000 e0845fa8 5fa0: 80200060 813a622c 00000000 00000000 00000003 200004c0 00000102 00000000 5fc0: 00000000 00000000 0014c2c8 00000129 7eb3532e 7eb3532f 003d0f00 76b9e0fc 5fe0: 76b9df08 76b9def8 00016ab0 00050bf0 60000010 00000003 00000000 00000000 Call trace: [<80479e9c>] (__kmap_local_page_prot) from [<807e997c>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<80479e9c>] (__kmap_local_page_prot) from [<807e997c>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360) [<807e9884>] (copy_page_to_iter) from [<814333f4>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:000000c7 r8:00000000 r7:00000001 r6:00000000 r5:84f43000 r4:84f43000 [<81433304>] (sk_msg_recvmsg) from [<816560a8>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<81433304>] (sk_msg_recvmsg) from [<816560a8>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000102 r8:00000000 r7:84bdc800 r6:84972800 r5:000000c7 r4:84ba6100 [<81655f58>] (unix_bpf_recvmsg) from [<81655124>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2529) r10:e0845df4 r9:00000102 r8:00000000 r7:00000102 r6:8441d900 r5:e0845f38 r4:81655f58 [<816550ec>] (unix_dgram_recvmsg) from [<813a29d4>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<816550ec>] (unix_dgram_recvmsg) from [<813a29d4>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:816550ec [<813a2984>] (sock_recvmsg) from [<813a2bd4>] (____sys_recvmsg+0x90/0x158 net/socket.c:2803) r7:00000000 r6:200004c0 r5:8441d900 r4:e0845f38 [<813a2b44>] (____sys_recvmsg) from [<813a5b18>] (___sys_recvmsg+0x88/0xbc net/socket.c:2845) r10:00000129 r9:84bdc800 r8:8441d900 r7:00000102 r6:200004c0 r5:e0845f38 r4:00000000 [<813a5a90>] (___sys_recvmsg) from [<813a6294>] (__sys_recvmsg net/socket.c:2875 [inline]) [<813a5a90>] (___sys_recvmsg) from [<813a6294>] (__do_sys_recvmsg net/socket.c:2885 [inline]) [<813a5a90>] (___sys_recvmsg) from [<813a6294>] (sys_recvmsg+0x74/0xb8 net/socket.c:2882) r8:80200288 r7:00000102 r6:200004c0 r5:00000000 r4:8441d900 [<813a6220>] (sys_recvmsg) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xe0845fa8 to 0xe0845ff0) 5fa0: 00000000 00000000 00000003 200004c0 00000102 00000000 5fc0: 00000000 00000000 0014c2c8 00000129 7eb3532e 7eb3532f 003d0f00 76b9e0fc 5fe0: 76b9df08 76b9def8 00016ab0 00050bf0 r7:00000129 r6:0014c2c8 r5:00000000 r4:00000000 Code: eaffffe8 e1a0c00d e92dd800 e24cb004 (e5901000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: eaffffe8 b 0xffffffa8 4: e1a0c00d mov ip, sp 8: e92dd800 push {fp, ip, lr, pc} c: e24cb004 sub fp, ip, #4 * 10: e5901000 ldr r1, [r0] <-- trapping instruction